Some people are insecure and need to make themselves feel better by trashtalking other people. There isn't much you can do about that so you can learn from it and apply it to real life as well. Someone will always try to take you down a knotch because of success. Any destiny streamer that excels in pvp and loses a match will have at least one person come in and say "hahahaha we beat you." It is jealousy dude, nothing you can do about it.